STOCK-BASED COMPENSATION Valuation Assumptions (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	43.50%	44.70%	42.20%	44.40%
Risk-free interest rate	0.50%	0.60%	0.60%	1.20%
Expected dividends	1.30%	0.60%	1.30%	0.60%
Expected life (in years)	4 years 110 days	4 years	4 years 110 days	4 years
Weighted-average grant date fair value	$ 10.84	$ 10.85	$ 10.43	$ 12.18
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	38.40%	38.70%	38.40%	38.70%
Risk-free interest rate	0.10%	0.10%	0.10%	0.10%
Expected dividends	1.10%	0.60%	1.10%	0.60%
Expected life (in years)	6 months	6 months	6 months	6 months
Weighted-average grant date fair value	$ 8.95	$ 8.00	$ 8.95	$ 8.00